Modern girl Layla transmigrates into a vampire novel, waking as a mud-covered beggar. Taken in by Kai, second son of the Voss family, she enters their ancient noble estate — where she is revealed as the true heir, marked by a silver crescent on her collarbone. Swapped at birth by Lord Morghras, she faces fake heiress Seraphina, who secretly feeds her mother corrosive potions. Armed with full knowledge of the plot, Layla neutralizes every trap: framed dark magic, poisoned wine, cursed dolls, a stolen relic. On the blood-moon night she burns both blood-oath contracts to save her mother, shattering Morghras's scheme. The family leaves her a choice: inherit the Voss name — or walk away with riches and a normal life. Coins in hand at sunset, her fate is her own.